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Showing 1 to 3 of 3 for “"Helium Crystals"”.
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X-Ray Debye -Waller Factor Measurements of Helium Crystals
… to multi-phonon processes being present in the crystals.
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Thermal vacancies and phase separation in bcc mixtures of helium-3 and helium-4
Thermal vacancy concentrations in crystals of 3He-4He mixtures have been determined from accurate measurements of the temperature dependence of the x-ray lattice parameter. A new x-ray diffractometer-position sensitive detector system is used to make measurements of the absolute lattice parameter …
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Thermal vacancies in solid helium-3
Thermal vacancy concentrations in crystals of 3He have been determined from high precision measurements of the tem3 perature dependence of the x-ray lattice parameter. Bcc He 3 was studied for molar volumes ranging from 20.3 to 24.8 cm ; mole for which the melting temperatures range from 2.36 to …